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Next, using your scissors cut one of the index cards in half. You will use each half of the index card to make a slit in the end of the shoe box.

 The vertical slit Place the two halves of the index card over one of the holes, creating a vertical slit (about 3/16" wide). Tape these pieces in place using masking or scotch tape.
Next, cut out one eyepiece of the rainbow glasses (or a piece of diffraction grating) and place it over the opening on the shoe box. Lightly tape the diffraction grating in place.  Placing the diffraction grating
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